EP3282024B1 - Batch furnace for annealing product and method for heat treatment - Google Patents

Description

The invention relates to a batch furnace for Glühgut. A batch furnace with the features of the preamble of claim 1 is for example made DE 102 27 499 A1 known.

In industrial furnace construction, a distinction is made between continuous furnaces and batch furnaces. Batch furnaces have a closed furnace space in which a single batch is heat treated. Examples of batch furnaces are single-coil ovens, which allow flexible and individual heat treatment of individual coils. Another example of a batch furnace are so-called chamber furnaces, which are used for the heat treatment of coils, billets and ingots. Such a chamber furnace is for example off DE 102 27 499 A1 known.

Known batch furnaces have flow line systems, for example, with nozzles, which guide and enter the heat transfer medium in the furnace chamber and act on the batch located in the furnace chamber with the heat transfer medium for convective heat transfer. The batch should be heated as homogeneously as possible in order to avoid damage to the batch by local overheating and to achieve the most uniform possible material properties.

This allows the chamber furnace according to DE 102 27 499 A1 a relative movement between the nozzles in the furnace chamber and the charge to be heated. The relative movement is achieved in that the nozzle system and / or the charge are rotatable.

The single-coil furnace is similarly constructed and has a single chamber in which a single coil is heat treated. As with the chamber furnace, flow channels are provided with nozzles that direct the heat transfer medium to the coil. Below or in front of the one-coil furnace, a charging system is arranged. When loaded from below, the furnace is mounted in a steel framework that creates space for handling the coils below the furnace.

The known chamber furnaces and one-coil furnaces are elaborately constructed and relatively large, which leads to correspondingly large energy losses and correspondingly requires extensive thermal insulation measures.

The invention is based on the object to improve a batch furnace of the type mentioned in that in a simple manner, a higher efficiency of the heat treatment is achieved.

According to the invention this object is achieved by a batch furnace with the features of claim 1.

The invention is based on the idea of specifying a batch furnace, in particular a single-chamber furnace or a one-coil furnace, with a furnace housing. The furnace housing has a closable feed opening, a furnace material receiving space, in particular a single receiving space, and means for convective heat transfer to the furnace good by a heat transfer medium. In the oven housing at least one fan is arranged. The batch furnace has at least one heating device for the heat transfer medium and / or at least one inlet for an externally heated heat transfer medium. The heating device is arranged directly in front of the suction side or directly behind the pressure side of the fan or circumferentially in an annular gap between the fan and the furnace housing. The position of the inlet for the externally heated heat transfer medium may be anywhere in the furnace are located, which allows access to the furnace interior, ie to the receiving space for the furnace material, so that the externally heated heat transfer medium can get into the receiving space. Preferably, the inlet for an externally heated heat transfer medium is arranged directly in front of the suction side or directly behind the pressure side of the fan or circumferentially in the annular gap between the fan and the furnace housing. The invention is not limited to this arrangement.

In other words, at least one heating device for the heat transfer medium is arranged directly in front of the suction side or directly behind the pressure side of the fan or circumferentially in the annular gap between the fan and the furnace housing. Alternatively or additionally, at least one inlet for an externally heated heat transfer medium is located directly in front of the suction side or directly behind the pressure side of the fan or circumferentially in the annular gap between the fan and the furnace housing or at any point which allows access to the interior of the oven, i. to the recording room allows.

The receiving space for the furnace material is arranged on the pressure side of the fan. This means that the receiving space can be located directly behind the pressure side of the fan or farther away from the pressure side.

On the suction side of the fan, the gaseous medium is sucked. On the pressure side of the fan, the gaseous medium exits the fan with increased pressure.

The invention has several advantages.

The present invention does not require any nozzles or nozzle system which is used in the prior art to apply the heat transfer medium to the furnace stock. This eliminates the flow channels provided in the prior art, which are arranged in the receiving space of the furnace housing and supply the nozzles with the heat transfer medium. One speaks therefore of an open volume of the furnace housing. The omission of the flow channels and the nozzles shortens the flow paths and reduces the pressure losses. With regard to the single-coil furnace, the invention enables the reduction of the suction area of the fan above the furnace or coil. The flushing losses when using a protective gas atmosphere are reduced due to the efficiently used furnace volume. Due to the compact design of the space required by the furnace and to be insulated outer surface of the furnace is reduced. This reduces heat losses without additional heat insulation measures.

As a heat transfer medium depending on the kiln good example. Hot air, exhaust gas or inert gas are used.

The batch furnace according to the invention is particularly suitable for the heat treatment of Aluminiumglühgut, especially Aluminiumcoils.

According to the invention, the heat transfer medium can be heated in different ways.

In one variant, the fan is assigned a heating device. The heating device is arranged directly in front of the suction side of the fan or directly behind the pressure side of the fan or circumferentially in the annular gap between the furnace housing and the fan. It is also possible that a heating device, in particular first heating device, directly in front of the suction side of the fan and / or a heating device, in particular second heating device, directly behind the pressure side of the fan and / or a heating device, in particular third heating device, circumferentially in the annular gap between the Oven housing and the fan are arranged.

In other words, the heating device, as well as the fan, is arranged in the furnace housing.

In the heating device arranged directly in front of the suction side of the fan, the heat transfer medium drawn in by the fan flows past the heating device and is heated thereby. The heated heat transfer medium flows through the fan and exits the fan on the pressure side. In this case, the heat transfer medium can pass through a further heating device, absorb heat and then flow into the receiving space. Alternatively, the heated heat transfer medium directly from the fan in the Recording space are initiated where the heat transfer medium meets the furnace material. The receiving space is located directly behind the pressure side of the fan.

When arranged directly behind the pressure side of the fan heater, the cool heat transfer medium flows through the fan and exits on the pressure side of this. Subsequently, the heat transfer medium passes through the heating device and absorbs heat. The receiving space is arranged downstream of the heating device in the flow direction, so that the furnace material located in the receiving space is exposed to the heated heat transfer medium.

When using a heating device, which is arranged circumferentially in the annular gap between the furnace housing and the fan, the heat transfer medium flows from the receiving space of the furnace through the annular gap back towards the suction side of the fan and heats up within the annular gap.

In the case of gas-fired furnace systems, a distinction is made in principle between two possible types of heating. Either the burner fires directly into the oven. Then one speaks of a direct heating device, since the exhaust gases are the heat transfer medium. In the indirect heating device, the burner fires within a closed circuit in a jet pipe. The hot tube then transfers the heat to the heat transfer medium. This means that no exhaust gas gets inside the oven. In the aluminum sector, both species are represented.

A further variant consists in that, instead of or in addition to the heating device, at least one inlet for an externally heated heat transfer medium, for example the exhaust air from another furnace system, is assigned to the fan.

The inlet in combination with a jet pipe can be arranged directly in front of the suction side or directly behind the pressure side or in the annular gap between the furnace housing and the fan. It is also possible that a plurality of inlets are provided in combination with a jet pipe, the directly in front of the suction side and directly behind the pressure side of the fan and in the annular gap between Furnace housing and fan in the furnace room or the receiving space open. It is also possible that the inlet can be made anywhere without the use of a jet pipe. Through the inlet, a heat transfer medium, preferably hot air or hot inert gas, or when using a jet pipe and hot exhaust gases are supplied to the batch furnace that is externally, that is heated outside the furnace. It is possible to combine one or more inlets for the externally heated heat transfer medium with one or more heating means, for example to bring a preheated heat transfer medium in the oven through the heating means to the desired final temperature.

The fan arranged in the furnace housing means that, compared to the known nozzle systems, shorter flow paths and thus lower pressure losses in the furnace housing are realized.

Preferred embodiments of the invention are specified in the subclaims.

Preferably, the receiving space is free of nozzle channels. This has the advantage that the useful volume is increased.

In a preferred embodiment, the heating device has an electrical resistance heater and / or a heating line for a gaseous heating medium. The heating cable can also be referred to as a jet pipe. The resistance heater has the advantage of easy control. The heating pipe has the advantage that exhaust gases from other furnaces can be used to heat the batch furnace. The exhaust gases do not get directly into the batch furnace, but are led through the heating pipe, which radiate the heat, so that the furnace atmosphere is not affected. Instead of exhaust gases other heating media can be used.

Preferably, a plurality of fans, in particular 2 fans, arranged in juxtaposition on both sides of the receiving space. Each fan is associated with at least one heating device and / or at least one inlet for an externally heated heat transfer medium. The heating device or the inlet for the externally heated Heat transfer medium and the respective associated fan form a unit that realizes the device for convective heat transfer.

This embodiment has the advantage that the furnace material is heated uniformly from two sides. The embodiment is particularly suitable, but not only for heating coils, in particular aluminum coils.

In the further preferred embodiment, the receiving space of the batch furnace is formed substantially hollow cylindrical. The fans are arranged on the front sides of the receiving space. As a result, a special compact design of the batch furnace is achieved, which allows a fast, efficient and homogeneous heating of the furnace.

Preferably, the fan has a drive which is arranged outside of the furnace housing. This has the advantage that the fan drive is exposed to no or a relatively low heat load, so that no special thermal insulation or heat dissipation measures must be provided for the drive.

If an annular gap between the fan and the furnace housing for the circulation of the heat transfer medium is formed, a particularly compact design is achieved, which manages without special installations for the circulation in the furnace housing.

The charging opening can be closed by a cover or by a plurality of cover elements. The lid or the cover elements are pivotable about an axis of rotation extending in the housing longitudinal direction. The fan is arranged in the stationary part of the furnace housing. This embodiment is particularly suitable for cylindrical batch furnaces, the furnace housing is divided in the longitudinal direction one or more times and thus forms the lid or the cover elements. In this embodiment, the furnace material, in particular the coil can be charged from above by means of a crane with coil winder.

Alternatively, the charging opening can be closed by at least one end wall element of the furnace housing, which can be pivoted about an axis of rotation extending in the housing transverse direction. The frontal Wall element is connected to the fan. This has the consequence that the fan is pivoted together with the front-side wall element when opening or closing the charging opening. The batch oven is charged from the front or the rear by means of a C-hook or stacker. In combination with a lid, a coil winder can also be used.

According to the invention, the feed opening can be closed by at least one end wall element of the furnace housing, which is axially displaceable in the housing longitudinal direction and connected to the fan. In this embodiment, therefore, the fan is moved together with the wall element axially to open or close the furnace. The feeding takes place in this case by a C-hook. In combination with a cover, a coil winder can be used.

In a particularly preferred embodiment, the furnace housing is divided and has an axially separable housing part, which at least partially forms the receiving space in the furnace operation. The separable housing part improves the handling and operation of the batch furnace. Thus, for example, the housing part can be exchangeable designed to adapt the length of the receiving space. This housing parts of different lengths can be used, so that the length of the receiving space to the length of the furnace good, for example. The length of the coils, can be adjusted. This has the advantage that the furnace volume can be adapted to the length of the respective furnace to be treated, which means a high degree of flexibility for the customer. This maximizes the useful volume and reduces flushing losses of the furnace, which contributes to a further increase in efficiency.

Additionally or alternatively, the detachable housing part may comprise transport means for moving the housing part. This facilitates the loading of the furnace material or the removal of the furnace good, which can be easily moved together with the housing part by the transport. A combination of the exchangeable housing part with the means of transport is possible.

According to a further preferred embodiment, the separable housing part is formed in one piece or divided with a lid or pivotable wings. The one-piece version is structurally simple. The split version allows good access to the kiln material when loading or unloading.

Preferably, the housing part is hollow cylindrical.

In a method for heat treatment of a furnace good, the furnace material can be arranged in the receiving space of the batch furnace, in particular the single-chamber furnace or single-coil furnace. The heat transfer medium heated in the furnace or outside the furnace can be blown through at least one, in particular by two fans, onto the furnace good, in particular directly onto the furnace good, for convective heat transfer.

The invention will be explained in more detail by means of exemplary embodiments with reference to the attached schematic drawings with further details.

Fig. 1

den Längsschnitt eines Chargenofens nach einem erfindungsgemäßen Ausführungsbeispiel mit zwei stirnseitig angeordneten Ventilatoren;

Fig. 2

den Längsschnitt eines Chargenofens nach einem weiteren erfindungsgemäßen Ausführungsbeispiel mit einem austauschbaren Mittelteil;

Fig. 3

den Chargenofen nach Figur 2 im separierten Zustand;

Fig. 4

den Querschnitt eines Chargenofens nach einem weiteren erfindungsgemäßen Ausführungsbeispiel mit einem schwenkbaren Deckel;

Fig. 5

den Längsschnitt eines Chargenofens nach einem weiteren erfindungsgemäßen Ausführungsbeispiel mit einem schwenkbaren Wandelement, und

Fig. 6

den Längsschnitt eines Chargenofens nach einem weiteren erfindungsgemäßen Ausführungsbeispiel mit einem verfahrbaren Mittelteil

In these show:

Fig. 1

the longitudinal section of a batch furnace according to an embodiment of the invention with two frontally arranged fans;

Fig. 2

the longitudinal section of a batch furnace according to another embodiment of the invention with an exchangeable center part;

Fig. 3

after the batch oven FIG. 2 in the separated state;

Fig. 4

the cross section of a batch furnace according to another embodiment of the invention with a hinged lid;

Fig. 5

the longitudinal section of a batch furnace according to another embodiment of the invention with a pivotable wall element, and

Fig. 6

the longitudinal section of a batch furnace according to another embodiment of the invention with a movable center part

The batch oven according to Fig. 1 is preferably but not exclusively used for the heat treatment of Aluminiumglühgut, such as aluminum coils. This in Fig. 1 The coil shown is the reference numeral 25. The batch furnace is generally applicable for coils (material-independent) or other Glühgut.

Concretely, the batch furnace is a single-coil furnace adapted for the heat treatment of individual coils. The invention is also applicable to single chamber furnaces suitable for the heat treatment of billets, billets or coils.

The batch furnace has a furnace housing 10 with a thermal insulation. The furnace housing may have a cylindrical shape. Other oven shapes are possible. The oven housing 10 defines a receiving space 12 in which the kiln material or the annealed material is arranged during operation of the batch kiln. This is a single receiving space 12. The receiving space 12 is in the batch oven according to Fig. 1 loaded with a coil, in particular an aluminum coil. For this purpose, the receiving space 12 has a bearing device 26 for the annealed material, in particular the aluminum coil. The bearing device may for example be a bearing block or a bearing rod and is connected to the bottom of the receiving space 12. The coil could also be deposited on its lateral surface. Other bearings are possible.

The receiving space 12 forms an empty space in the unloaded state of the batch furnace. The receiving space 12 is accessible through a closable feed opening 11, the example in different variants in the FIGS. 3 to 5 is shown and explained in more detail below.

The receiving space is in accordance with the batch oven Fig. 1 essentially hollow cylindrical and thus adapted approximately to the shape of the coil to be heated.

The furnace housing 10 has a device for convective heat transfer 13 to the Glühgut by a heat transfer medium. The heat transfer medium may be, for example, hot air. Depending on the material to be annealed another heat transfer medium, such as exhaust gases of another furnace or inert gas can be used.

The device for convective heat transfer 13 comprises a fan 14 and a fan 14 associated with the heating device 15 for the heat transfer medium. Concretely, the device for convective heat transfer 13 comprises two fans 14, to each of which a heating device 15 is assigned. The invention is not restricted to a specific number of fans 14 or heating devices 15. It is also possible to generally provide more than one fan and more than one heater in the oven housing 10.

The arrangement of two fans 14 and two heating devices 15 is particularly advantageous for the heating of coils. In Fig. 1 It can be seen that the heating device 15 is arranged directly in front of the suction side 16 of the fan 14. This applies to both fans 14 and the corresponding heating devices 15. The receiving space 12 connects directly to the pressure side 17 of the fan 14. In other words, the receiving space 12 on both axial sides, that is limited in the longitudinal direction of the furnace housing 10 by the fans 14 and their pressure sides 17.

Alternatively or in addition to the heating devices 15 arranged on the suction side 16, further heating devices 15 can be arranged on the pressure side 17 of the fan 14. In this case, the heating means 15 arranged on the pressure side 17 delimit the receiving space 12 in the longitudinal direction of the oven housing 10.

Instead of or in addition to the heating devices 15, the oven housing 10 may have one or more inlets for a heat transfer medium heated outside the oven housing (not shown). The respective inlet (s) open on the suction side 16 or on the pressure side 17 of the fan 14 into the housing 10. The inlets for the externally heated heat transfer medium can be combined with the heating device 15.

As in Fig. 1 can be seen, the furnace housing 10 except for the fans 14, the heating means 15, the bearing means 26 for the coil 25 and any measuring devices, for example. For the oxygen content, temperature and pressure, installation free. The receiving space 12 is at least free of nozzle channels, since the convective heat transfer through the fans 14 and the Heating device 15 takes place. Thus, an open furnace volume is created, which means low pressure losses, low flushing losses and little effort for the thermal insulation.

The heating device 15 overlaps at least partially, in particular completely, the effective area of the fan 14, but may also be placed in the annular gap between the oven housing and the fan. The heating device 15 extends in relation to the fan 14 in the radial direction and along the fan circumference. In this case, the heating device 15 through openings (not shown), through which the heat transfer medium can flow.

The heating device 15 can be designed as a uniform heating element with a central power supply or as separate heating elements, each with its own energy supply.

In the example according to Fig. 1 If the heating device 15 is designed as an electrical resistance heater. The resistance heating has jet-shaped heating coils, which extend radially from the inside to the outside with respect to the fan 14. In the example according to Fig. 1 cover the heating coils, the wings of the fan 14, ie the length of the heating coils corresponds approximately to the wing length. Between the heating coils, the heat transfer medium can flow. It is also possible to let the resistance heating spiral from the axis of rotation of the fan in the direction of the oven housing or to place the heating coil circumferentially in the annular gap between the oven housing and fan.

The fan and heating units according to Fig. 1 are symmetrical.

Instead of the electrical resistance heating, the heating device 15 may have a heating line or a plurality of heating lines for a gaseous heating medium. Here, hot air and hot gases, such as exhaust gases are used. It is also possible to combine the resistance heating and the heating lines, so that the batch oven has hybrid heating.

The heat transfer medium flows in operation past the heating device 15 and absorbs heat. The heated heat transfer medium flows through the fan 14 and exits on the pressure side (see thick arrows). There, the annealing material in the receiving space 12 is acted upon by the heated heat transfer medium.

For a compact design, the fans 14 and the heating device are arranged in each case on the end faces 18, 19 of the hollow cylindrical receiving space 12. As a result, the useful volume of the receiving space 12 is maximized.

The fan 14 is an axial fan.

The fans 14 each have a drive 20, in particular an electric motor, which is arranged outside of the furnace housing 10. The electric motor or generally the drive 20 is coupled in a conventional manner directly to the fan 14, connected by means of belt drive with the fan or in rare cases also connected via a gear to the fan.

The furnace housing 10 has generally at the end faces 18, 19 a substantially rotationally symmetrical recess 27 which extends into the furnace housing 10 and has a closed further end face.

The recess 27 has in the example according to Fig. 1 in concrete terms, an inwardly, ie towards the receiving space 12 out, tapered section, which merges into a cylindrical section. The cylindrical portion is closed to the receiving space 12. The recess 27 can have a different geometry, for example a continuous cylindrical or continuous conical geometry.

The recess 27 and the center axis M of the furnace housing 10 are arranged coaxially. The mounting of the fan 14 is connected to the recess 27, in particular to the cylindrical portion. The fan is arranged parallel to the further end face of the recess 27. The heating device 15 is fastened to the wall of the recess 27 arranged in the furnace housing 10. This results in a coaxial arrangement of Heating device 15, the fan 14 and the drive shaft of the drive 20. In addition, it is achieved by the recess 27 that the fan 14 is arranged as close as possible to the storage 26 for the annealing in the receiving space 12. Inside the recess 27 and thus outside of the furnace housing 10, the drive 20, specifically the drive train is arranged.

Between the fan 14 and in the furnace housing 10, an annular gap 21 is formed, which allows the circulation of the heat transfer medium in the receiving space 12 and generally in the furnace housing 10. The circulation is characterized by the thick arrows on the pressure side 17 of the fan 14 and the thin arrows on the suction side 16. The heat transfer medium is thus circulated in the receiving space 12 or generally in the furnace housing 10, wherein the heated heat transfer medium flows in the direction of the Glühguts 25 and the receiving space 12. The cooled heat transfer medium flows through the annular gap 21 back to the suction side 16 of the fan 14 and is there heated by the heating device 15 to flow through the fan 14 back to the pressure side 17.

In the example according to Fig. 2 it is provided that the furnace housing 10 is divided and has an exchangeable housing part 24, in particular center piece, which is characterized by a box. In Fig. 3 is shown how the housing part 24, in particular centerpiece or middle part, is separated from the two lateral wall elements 23 to replace this. The batch furnace can therefore be adapted to different Glühgutteile, especially different coils of length. This has the advantage that the distance between the fans 14 and the coil 25 is constant even at different lengths.

The batch oven after the Fig. 2 . 3 also offers the possibility of opening or closing the feed opening 11 by axial displacement of the lateral wall elements 23, so that the receiving space 12 can be charged by a C-hook or stacker. In combination with Fig. 4 is also a coil winder used.

Alternatively, as in Fig. 4 illustrated, the feed opening 11 are opened or closed by a cover 22 which can be pivoted about an axis of rotation of the furnace housing 10 extending. These Execution is particularly suitable for cylindrical oven housings. The axis of rotation is arranged laterally from the vertical center plane. The lid 22 has a parallel to the axis of rotation extending closure side, which is arranged on the other side of the vertical center plane.

The fan 14 with the heating device 15 is arranged in the stationary part of the furnace housing 10 and is not moved with the cover 22.

Alternatively, two pivotable blades may be provided for opening and closing the batch furnace. The axes of rotation of the wings are each arranged laterally opposite each other from the vertical center plane. The two Verschlusseiten of the wings, so the wing sides, which are locked together in the closed position, are in the closed position in the vertical center plane of the batch furnace. The wings are hinged to a bottom piece of the furnace housing. The wings together with the bottom piece, the lateral surface of the hollow cylindrical furnace housing.

In the embodiment according to Fig. 5 is to open or close the feed opening 11, the lateral wall element 23 about a transverse to the central axis M axis of rotation pivotally. In this variant, the fan 14 and the heating device 15 are fixedly connected to the lateral wall element and are moved when opening or closing the feed opening 11.

The example according to Fig. 6 relates to a variant of the batch furnace after Fig. 3 in which the wall elements 23 are movable, in particular movable, axially, ie along the longitudinal axis of the batch furnace. With regard to the features described in the embodiments according to Fig. 3 and Fig. 6 match, will go to the description too Fig. 3 Referenced. In the example according to Fig. 6 the furnace housing is formed in three parts. The two wall elements 23 and the housing part 24 form the furnace housing 21 in the closed position, ie during operation of the batch furnace. In contrast to the example according to FIG Fig. 3 , is in accordance with the execution Fig. 6 the housing part 24 is formed as a bottom piece. The jacket surface of the furnace housing 21 in the region of the housing part 24 is formed by the wall elements 23. The wall elements 23 each have a housing extension 28, which is the lateral surface of the wall elements 23 in axial direction, ie extend in the longitudinal direction of the batch furnace. In the closed position, the housing extensions 28 overlap the housing part 24.

The formed as a bottom piece housing part 24 is movable. For this purpose, the housing part 24 transport means 29, for example in the form of rollers (dolly). Other means of transport are possible. The transport means 29 is designed so that a movement of the housing part 24 transversely to the longitudinal direction of the batch furnace is possible. The furnace material is mounted on the housing part 24, as in Fig. 6 good to see. Specifically, the coil is on the trolley.

The batch oven according to Fig. 6 works as follows. The two outer wall elements 23 are removed after the heat treatment in the axial direction of the housing part 24, as indicated by the arrows in the longitudinal direction of the furnace housing 21. The coil is moved on the housing part 24 or the trolley from the oven and taken away. The next coil to be treated, which is in the waiting position on a further housing part 24 or dolly, is moved between the two wall elements 23. Subsequently, the wall elements 23 for closing the batch furnace are moved axially in the direction of the housing part 24. Then the two housing extensions 28 are connected to each other and the wall elements 23 to the housing part 24. When the closed position of the batch furnace is reached, the heat treatment begins.

LIST OF REFERENCE NUMBERS

10

furnace housing

11

loading port

12

accommodation space

13

Device for convective heat transfer

14

fan

15

heating device

16

suction

17

pressure side

18

front sides

19

front sides

20

drive

21

annular gap

22

cover

23

wall elements

24

Housing part / center piece

25

coil

26

Storage facility

27

recess

28

housing extension

29

Mode of Transport

Claims (12)

1. Batch furnace for annealing product, in particular, a single-chamber furnace or a single-coil furnace, with a furnace housing (10), which comprises a lockable loading opening (11), an accommodating space (12) for furnace product and a device for convective heat transfer (13) to the furnace product via a heat transfer medium, wherein the batch furnace comprises:

   - at least one fan (14), which is arranged in the furnace housing (10),

   - at least one heating device (15) for the heat transfer medium and/or at least one inlet for an external heated heat transfer medium, wherein the heating device (15) is arranged directly in front of the suction side (16) or directly behind the pressure side (17) of the fan (14), or circumferentially arranged in an annular gap (21) between the fan (14) and the furnace housing (10), and

   - an accommodating space (12) for the furnace material, which is arranged on the pressure side (17) of the fan (14),

   characterized in that the loading opening (11) can be sealed by at least one front-side wall element (23) of the furnace housing (10), which is axially displaceable in the housing's longitudinal direction and is connected to the fan (14).
2. Batch furnace according to Claim 1,
   characterized in that
   the accommodating space (12) is free of nozzle ducts.
3. Batch furnace according to Claim 1 or 2,
   characterized in that
   the heating device (15) comprises an electrical resistance heater and/or a heat line for a gaseous heat medium.
4. Batch furnace according to any one of the preceding claims,
   characterized in that
   a plurality of fans (14), in particular two fans (14), are arranged at an opposite position on both sides of the accommodating space (12), wherein at least one heating device (15) and/or at least one inlet for an externally heated heat transfer medium is assigned to each fan (14).
5. Batch furnace according to any one of the preceding claims,
   characterized in that
   the accommodating space (12) is essentially hollow cylindrical, wherein the fans (14) are arranged on the front sides (18, 19) of the accommodating space (12).
6. Batch furnace according to any one of the preceding claims,
   characterized in that
   the fan (14) comprises a drive (20), which is arranged outside of the furnace housing (10).
7. Batch furnace according to any one of the preceding claims,
   characterized in that
   an annular gap (21) is formed between the fan (14) and the furnace housing (10) for the circulation of the heat transfer medium.
8. Batch furnace according to any one of the preceding claims,
   characterized in that
   the loading opening (11) can be sealed by at least one cover (22) or a plurality of cover elements, which is/are pivotable around an axis of rotation in the housing's longitudinal direction, and the fan (14) is arranged in the stationary part of the furnace housing (10) .
9. Batch furnace according to one of the Claims 1 to 7,
   characterized in that
   the loading opening (11) can be locked by at least one front-side wall element (23) of the furnace housing (10, which can be pivoted around a axis of rotation running in the housing's transverse direction and is connected to the fan (14).
10. Batch furnace according to any one of the preceding claims,
    characterized in that
    the furnace housing (10) is divided and comprises a housing part (24) that can be axially detached, which at least partially forms the accommodating space (12) during furnace operation.
11. Batch furnace according to Claim 10,
    characterized in that
    the housing part (24) is formed as a single piece or divided with a cover or pivoting leaves.
12. Batch furnace according to Claim 10 or 11,
    characterized in that
    the housing part (24) can be replaced and/or comprises transport means for moving the housing part (24).

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